﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.RegularExpressions;

namespace AllPurposeCard
{
    class ZhengZeBiaoDa
    {
        public bool Number(string str_number)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(str_number, "^[0-9]+$");
        }
    }
}
